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HE-800A
5. OPERATION
49
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. Underlay programs
Four types of underlay patterns are available. These four types can also be combined. Refer to the examples of use to
determine which type of underlay to use.
Parameter No.
45 46 47 58
Underlays sewn together Saw-shape underlays Rectangle underlays Zigzag underlay stitch
Underlays sewn together
ƒ This type of underlay pattern is used for resewing if the knife has operated before the seam has been formed, such
as when sewing is complete without the upper thread breaking even though the lower thread has run out. It is
particularly useful for sewing up the hole made by the knife beforehand at times when zigzag stitches do not hold
properly.
ƒ The pile of fluffy fabrics is pressed down before sewing, so that the buttonhole finish looks more attractive.
Saw-shape underlays
ƒ This type of underlay is useful for stretch materials to prevent them from stretching.
ƒ It is useful for preventing dimples from forming during bar tacking. Radial-type buttonholes are useful for preventing
dimples.
ƒ It is also useful for strengthening the buttonholes to stop the seam from unravelling, which can often happen with
materials with coarse weaves.
Rectangle underlays
ƒ This type of underlay is useful for stretch materials to prevent them from stretching.
ƒ This is effective in preventing seams from unravelling in materials which appear not to have a very coarse weave. It
also serves to reinforce the buttonhole.
ƒ If the seam is hidden and the seam width seems small, you can sew 2 - 3 rectangle underlays to make the material
look more voluminous.
ƒ Underlays such as (1) to (9) in the illustration can be sewn in slightly different positions by changing the setting
value for parameter No. 50 (underlay offset) so that the seam does not become too stiff and to further increase the
feeling of volume.
Zigzag underlay stitch
If parameter No. 58 (Zigzag underlay stitch width) is set after saw-shaped underlay stitches or rectangle underlay
stitches have been set, zigzag underlay stitches will only be sewn for the first cycle of saw-shaped underlay stitching
or rectangle underlay stitching.
ƒ This is particularly effective in preventing seams from unravelling in materials which appear not to have a very
coarse weave. It also serves to reinforce the buttonhole.
ƒ If parameter No. 58 (Zigzag underlay stitch width) [Dimension A in the illustration] is set to about 0.4 mm, the
zigzag underlay stitches will be even stronger than other underlay stitches.
Note:
ƒ When sewing underlays, the number of bar tacking stitches will increase, so that thread breakages or broken
needles may occur. To avoid such problems, reduce the number of underlays or drop the sewing speed.
ƒWhen underlays above are sewn together, the order of sewing is underlays sewn together o saw-shape
underlays o rectangle underlays.
3933Q3932Q
3934Q
3931Q